Alonzo g



ooooooo v A. G. TURNER.

' DRILL.

N0.499,312. 'v PatentedJunelii 1893.

NITED STATES FFi'ciE.

PATENT ALONZO G. TURNER, OF DURANGO, COLORADO, ASSIGNOR OF TWO-THIRDS TOFRANK A.- KIMBALL AND. ALEXANDER LEVY.

D R L.

SPECIFICATION forming part of Letters Patent No. 499,312,dated June 13,1893. Application filed January 9, 1893- Serial No. 457,773- (No model.)

To all whom it may concern: 7

3e it known that I, ALoNzo G. TURNER, a citlzen of the United States,residing at Durango, inthe county of La Plata and State of Colorado,have invented certain new and use ful Improvements in Drills; and I dohereby declare the following to be'a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

My invention relates to drills, and particularly to that class of drillsemployed in rock drilling or in the drilling of wells; and my inventionconsists in the novel construction and arrangement of the parts, as ishereinafter deeration, and the drill unscrewed. This object is attainedin the mechanism herein described and illustrated in the drawings whichaccompany and form a part of this application, in which the samereference letters indicate the same or corresponding parts, and inwhich- Figure '1 is a perspective view of the upper end or head of thedrill, and shows the looking bolt which looks the drill to thedrill-rod. Fig. 2 is a perspective view of the lower end of thedrill-rod, showing the ratchet teeth with which the locking boltengages. Fig. 3 is a vertical section of the drill and drillrod joinedtogether, the plane of section passing through the axis of the drill anddrill-rod and through thecenter of the chamber within which the lockingbolt works. Fig. at is a horizontal section of the drill and drill-rod,the plane of section being perpendicular to the plane of section of Fig.3, and likewise passing through the center of the chamber within whichthe locking. bolt works. 7 Fig. 5 is a detail perspective view 'of thelocking bolt. Fig. 6 is an elevatiohot' a catch-pin to be hereinaftermentioned.

In the drawings, A, is the drill, and the I .Within the drill A is alongitudinal chamber E, within which chamber slides a locking bolt, F.This locking bolt consists of two parts, viz., the head, f, andthe stem,f. The head fis provided with ratchet teeth corresponding to the teethof the drill-rod B. The chamber E corresponds in shape with the bolt F,

and'consists of a longitudinal bore or passage closely embracing thestem f of the bolt F, thus serving'to guide this bolt as it slides backand forth. The upper end of this chamber E is enlarged to receive thehead f of the bolt F; The chamber E is most readily formed in'the drillby boring in its end several parallel and closely adjacent holes, thecenter holebeing carried down much deeper than, I the others to form thepassage which receives .the stem of the bolt F, and after these holesare bored cutting out the webs of metal lying between them.

A spring, G, at the bottom of the chamber E, tends to push outward thebolt F, this movement of the pin being limited by a screw H the point ofwhich projects into the chamber E and works in a slot hin the head ofthe bolt.

When pushed outward by the spring G the teeth of the bolt F engage withthe teeth of the drill rod B, and lock the same, so that it isimpossible to turn backward the drill-rod to unscrew it from the drill.By drawing inward the bolt F its teeth are disengaged from the teeth Dof the drill-rod, which may then be unscrewed. For the purpose ofdrawing inward the bolt F there is provided a slot I in the side of thedrill at a point directly over the stem f, and in this stem f is acorrespondin g recess 2'. When it is desired to draw inward the bolt F apointed tool is inserted through the slot I into this depression 2', sothat the point of the tool catches in this depression, and the bolt Fmay then be pulled back. To hold the bolt disengaged from the teeth ofthe drill-rod B there is provided a catch-pin, K, working in a radialpassage L opening into, but placed slightly to one side of, the chamberE. The position of this pin K and of the passage L within which itworks, is clearly shown in Figs. 3 and 4:- In the side of the bolt F isa recess M, and the shank of the catch-pin K is cut away at the neck soas to form a shoulder, N, adapted to fit into this recess M and lock thebolt F. This recess M is so situated on the bolt F that when the bolt isdrawn inward far enough so as to be free from the teeth D of thedrill-rod B this recess M will be opposite the pin K, and a spring 0then pushes this pin K upward so that the shoulderN fits into the recessM and holds the bolt F locked.

The head of the pin K should preferably project slightly above thesurface of the drill when it is locking the bolt F in the manner justdescribed, so that should it ever happen, through oversight, that thedrill and drill-rod, after having been screwed together, should bedropped into the well without first releasing the bolt F and permittingits teeth to engage with the teeth D of the drill-rod B, the head of thepin K will be pressed inward by the sides of the well as the drillenters the well, thus releasing the bolt F, which will then be forcedoutward by its spring G into engagement with the teeth D of thedrill-rod B.

Radial holes, 0, O, are provided in the drill A, opening into thechamber E at suitable points, so that through these holes any sand whichmay collect in the chamber E may be removed.

The operation of this device is as follows:- The locking bolt F being inthe position shown in Fig. 1, when the drill and drill-rod are screwedtogether the teeth of the bolt F will engage with the teeth of thedrill-rod in such a manner as to make it impossible to unscrew the drillfrom the drill-rod, but olfering no resistance to the screwing togetherof the drill and drill-rod, the bolt F being de pressed as the teeth Dpass over it. The drill and drill-rod can thus be screwed together untiltheir end faces are in contact, so that these faces, and not the threadsof the screw may bear all the force of the blows delivered by the drill,and the teeth of the drill-rod B engaging with the teeth of the bolt Fmake it impossible for any turning of the drill in the well to cause thedrill to unscrew from the drill-rod. When it is desired to unscrew thedrill from the drillrod, a pointed instrument is introduced through theslot I into the recess t' of the bolt F, and the bolt is then drawnbackward until the recess M is opposite the pin K, when the spring 0forces the pin K upward until the shoulder N enters the recess M andholds the bolt locked. The drill may now be unscrwed from the drillrod.hen it is desired to release the locking bolt F so that when thedrilland drill-rod are again screwed togeth er theymay be locked, the pin Kis pressed inward, releasing the bolt F, which is then pushed outward byits spring G. It is obvious that while this locking device is especiallyadapted to securing drilling tools together, it is also adapted to thescouring together of any rods or shafting where it is important that theparts shall not become separated while in operation.

Having thus completely described my invention, what I claim, and desireto secure by Letters Patent, is

l. The combination with a drill and drill rod screwing together end toend, the said drill rod being provided with a concentric series ofratchet teeth on its end, of a spring actuated locking bolt working in achamber within said drill adapted to engage with the said concentricseries of ratchet teeth, means whereby the locking bolt may be withdrawnfrom the ratchet teeth,and a spring actuated catch pin for locking thebolt in its disengaged position, substantially as described.

2. The combination with a drill and drill rod screwing together end toend, the said drill rod being provided with a concentric series ofratchet teeth on its end, of a spring actuated locking bolt working in achamber within said drill adapted to engage with the said concentricseries of ratchet teeth, means whereby the locking bolt may be withdrawnfrom-the ratchet teeth, and a spring actuated locking pin for lockingthe locking bolt in its disengaged position, which normally rests belowthe surface of the drill, and only projects above the surface of thesame when holding the locking bolt withdrawn, substantially asdescribed.

3. The combination, with a drill and drillrod screwing together end toend, and ratchet teeth in the end of the drill rod arranged in a ringconcentric with the drill-rod, of a springactuated locking bolt workingin a chamber within the drill, its end projecting from the 5 end of thedrill and provided with ratchet teeth adapted to engage with the ratchetteeth of the drill-rod, means for drawing inward the In testimonywhereof I affix my signature in presence of two witnesses.

ALONZO e. TURNER.

Witnesses:

MERRILL N. BLAKSLEE, WILLIAM A. MARSH.

